148 lines
3.3 KiB
Go
148 lines
3.3 KiB
Go
// Copyright 2017 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package gcp
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import (
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"context"
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"fmt"
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"time"
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"golang.org/x/oauth2/google"
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dns "google.golang.org/api/dns/v1"
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"github.com/lordwelch/cloud-dyndns-client/pkg/backend"
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)
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var cloudDnsScopes = []string{
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dns.CloudPlatformScope,
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dns.CloudPlatformReadOnlyScope,
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dns.NdevClouddnsReadonlyScope,
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dns.NdevClouddnsReadwriteScope,
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}
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type cloudDNSRecord struct {
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dns.ResourceRecordSet
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}
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func (c *cloudDNSRecord) Name() string {
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return c.ResourceRecordSet.Name
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}
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func (c *cloudDNSRecord) Type() string {
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return c.ResourceRecordSet.Type
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}
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func (c *cloudDNSRecord) Ttl() int64 {
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return c.ResourceRecordSet.Ttl
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}
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func (c *cloudDNSRecord) Data() []string {
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return c.ResourceRecordSet.Rrdatas
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}
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// TODO: New backend
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type cloudDNSBackend struct {
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client *dns.Service
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project string
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zone string
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timeout time.Duration
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}
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func NewCloudDNSBackend(project, zone string) (backend.DNSBackend, error) {
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client, err := getDNSClient()
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if err != nil {
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return nil, err
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}
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return &cloudDNSBackend{
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client: client,
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project: project,
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zone: zone,
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timeout: 5 * time.Second,
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}, nil
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}
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func (b *cloudDNSBackend) GetRecord(ctx context.Context, dnsName, dnsType string) (backend.DNSRecord, error) {
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var record *dns.ResourceRecordSet
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call := b.client.ResourceRecordSets.List(b.project, b.zone)
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err := call.Pages(ctx, func(page *dns.ResourceRecordSetsListResponse) error {
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for _, v := range page.Rrsets {
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if v.Name == dnsName && v.Type == dnsType {
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record = v
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}
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}
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return nil // NOTE: returning a non-nil error stops pagination.
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})
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if err != nil {
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return nil, err
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}
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if record == nil {
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return nil, nil
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}
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return &cloudDNSRecord{*record}, nil
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}
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func (b *cloudDNSBackend) UpdateRecords(ctx context.Context, additions []backend.DNSRecord, deletions []backend.DNSRecord) error {
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a := []*dns.ResourceRecordSet{}
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d := []*dns.ResourceRecordSet{}
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for _, r := range additions {
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a = append(a, &dns.ResourceRecordSet{
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Name: r.Name(),
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Type: r.Type(),
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Ttl: r.Ttl(),
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Rrdatas: r.Data(),
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})
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}
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for _, r := range deletions {
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d = append(d, &dns.ResourceRecordSet{
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Name: r.Name(),
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Type: r.Type(),
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Ttl: r.Ttl(),
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Rrdatas: r.Data(),
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})
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}
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change := &dns.Change{
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Additions: a,
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Deletions: d,
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}
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_, err := b.client.Changes.Create(b.project, b.zone, change).Context(ctx).Do()
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if err != nil {
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return err
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}
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return nil
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}
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func getDNSClient() (*dns.Service, error) {
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client, err := google.DefaultClient(context.Background(), cloudDnsScopes...)
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if err != nil {
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return nil, fmt.Errorf("Could not create Google Cloud DNS client: %v", err)
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}
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service, err := dns.New(client)
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if err != nil {
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return nil, fmt.Errorf("Could not create Google Cloud DNS client: %v", err)
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}
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return service, nil
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}
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